期刊
PHYTOCHEMISTRY
卷 72, 期 7, 页码 624-634出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2011.01.037
关键词
Orobanche cumana; Orobanchaceae; Broomrape; Helianthus annuaus; Sunflower; Asteraceae; Parasitic weeds; Germination stimulant; Guaianolide sesquiterpene lactones; Dehydrocostus lactone; Fluridone; Phosphate starvation
资金
- BARD
- US-Israel Agricultural Research and Development fund [IS-1421, IS-2170, IS-4067-07]
- Ministry of Agriculture in Israel [132-1176-04, 132-1329-07]
The germination of the obligate root parasites of the Orobanchaceae depends on the perception of chemical stimuli from host roots. Several compounds, collectively termed strigolactones, stimulate the germination of the various Orobanche species, but do not significantly elicit germination of Orobanche cumana, a specific parasite of sunflower. Phosphate starvation markedly decreased the stimulatory activity of sunflower root exudates toward O. cumana, and fluridone - an inhibitor of the carotenoid biosynthesis pathway - did not inhibit the production of the germination stimulant in both shoots and roots of young sunflower plants, indicating that the stimulant is not a strigolactone. We identified the natural germination stimulant from sunflower root exudates by bioassay-driven purification. Its chemical structure was elucidated as the guaianolide sesquiterpene lactone dehydrocostus lactone (DCL). Low DCL concentrations effectively stimulate the germination of O. cumana seeds but not of Phelipanche aegyptiaca (syn. Orobanche aegyptiaca). DCL and other sesquiterpene lactones were found in various plant organs, but were previously not known to be exuded to the rhizosphere where they can interact with other organisms. (C) 2011 Elsevier Ltd. All rights reserved.
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